@TriXwooD : i can confirm - i succesfully run two radios - rfm69 and nrf24 on RPi - on the spi0 runs rfm69 and on spi1 runs nrf24. Started two separated mysensors gateway on ports 5003 and 5004 and everythng runs fine!

Hi,
i successfully added heartbeat sending to RelayActuator.ino and relay sensor is sending data every one minute - but domoticz don't update last seen - this is only visible on gateway log. So i decided to send relay status as heartbeat - i have relay with two relay switches.

Source code:

#define MY_RADIO_RFM69
#define MY_RFM69_NEW_DRIVER

#define MY_NODE_ID 3


// Enable repeater functionality for this node
//#define MY_REPEATER_FEATURE

#include <SPI.h>
#include <MySensors.h>



#define RELAY_1  3  // Arduino Digital I/O pin number for first relay (second on pin+1 etc)
#define RELAY_2  4  // Arduino Digital I/O pin number for first relay (second on pin+1 etc)
#define NUMBER_OF_RELAYS 2 // Total number of attached relays
#define RELAY_ON 1  // GPIO value to write to turn on attached relay
#define RELAY_OFF 0 // GPIO value to write to turn off attached relay

#define MY_DEBUG_VERBOSE

long double last_heartbeat_time = millis();
long double HEARTBEAT_TIME = 30000;

int oldValue=0;
bool state;

MyMessage msg(2,V_LIGHT);
MyMessage msg2;


void before() { 
  for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS;sensor++, pin++) {
    // Then set relay pins in output mode
    pinMode(pin, OUTPUT);   
    // Set relay to last known state (using eeprom storage) 
    digitalWrite(pin, loadState(sensor)?RELAY_ON:RELAY_OFF);
  }
}

void setup() {

}

void presentation()  
{   
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("Relay", "1.0");

  for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS;sensor++, pin++) {
    // Register all sensors to gw (they will be created as child devices)
    present(sensor, S_LIGHT);
  }
}


void loop() 
{
   long double temp = (millis() - last_heartbeat_time);
  if (temp > HEARTBEAT_TIME) {
  // If it exceeds the heartbeat time then send a heartbeat
  sendHeartbeat();
  send(msg.set(msg2.getBool()?1:0)); 
  last_heartbeat_time = millis();
  Serial.println("Sent heartbeat" );
  }
}

void receive(const MyMessage &message) {

  // We only expect one type of message from controller. But we better check anyway.
  if (message.type==V_LIGHT) {
     // Change relay state
     digitalWrite(message.sensor-1+RELAY_1, message.getBool()?RELAY_ON:RELAY_OFF);
     // Store state in eeprom
     saveState(message.sensor, message.getBool());
     // Write some debug info
     Serial.print("Incoming change for sensor:");
     Serial.print(message.sensor);
     Serial.print(", New status: ");
     Serial.println(message.getBool());
     msg2 = message;
   } 
}

but state is send only for one switch (second) and when i try to change switch 1 - this change is send aslo as relay 2. I added msg2 for export message from recieve to loop.

How to send status for both relays as heartbeat?